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Sequoia 680 Chesapeake Dove Redwood City CA 94063 (650)364-9600 FAx(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste 0 Petaluma,CA 94954 (707)792 1865 FAX(707)79Z-0342 <br /> 1551 Industrial Road San Carlos, CA 94070-4111 (650)232 9600 FAX(650)232 9612 <br /> Ground Zero Project - Sampled 3/29/99 <br /> 1714 Main St Project Number Project No 96-163,Knowles Roek Received 3/29/99 <br /> Escalon,CA 95320 Project Manager Justin Powers Reported 4/11/99 <br /> Total Purgeable Hydrocarbons(C6-C12)and BTEX by DHS LLFT/Quality Control <br /> Sequoia Analytical-San Carlos <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> JAnalyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> ' Batch 9040002 Date Prepared 411/99 Extraction Method EPA 5030B [P/Tl <br /> Blank 9040002-BLK1 <br /> Purgeable Hydrocarbons as Gasoline 4/1/99 ND ug/] 500 <br /> Benzene' ND 11 0 500 Toluene ND '' 0 500 <br /> zene <br /> EthylbenND 0 500 <br /> Xylenes(total) ND 0 500 <br /> ' Surrogate a a a-Trtfluorotoluene 100 106 600-140 106 <br /> LCS 9040002-BSI <br /> Purgeable Hydrocarbons as Gasoline 4/1/99 250 263 ug/l 700-130 105 <br /> Suttogate a a a-Triflumotoluene " 100 183 600-140 183 2 <br /> Matrix Spike 9040002-MSI L903235-01 <br /> Pi'rrtor'91'Spihe <br /> geable Hydrocarbons as Gasoline 4/1/99 250 ND 270 ug/1 600-140 108 <br /> te aaa-Triuoiotoluene 100 142 600-140 142 2 Dup 9040002-MSDI L903235-01 <br /> Purgeable Hydrocarbons as Gasoline 4/1/99 250 ND 256 ug/1 600-140 102 25 0 571 <br /> Surrogate a a,a-Trtfluorotoluene 01100 163 600-140 163 2 <br /> 1 <br /> 1 <br /> uoia Analytical-San Carlos *Refer to end of report for text of notes and definitions <br /> ' Page 4 of 5 <br />